[issue1538] Avoid string copy when split char doesn't match

[Skip Montanaro]

Skip Montanaro added the comment:

I'm not sure why a string subclass shouldn't work, but I've attached a new 
version of the patch that calls PyString_CheckExact() to prevent using a 
string subclass.

Added file: http://bugs.python.org/file8864/string-split.patch

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